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POWER OF ATTORNEY
For Executing Forms 3, 4 and 5
Know all by these present,that the undersigned hereby
constitutes and appoints each of Joseph Vittiglio, Carolyn Rucci
and Nancy Smith, signing singly, his true
and lawful attorney-in-fact to:
(1) execute for and on behalf of the undersigned,in the
undersigneds capacity as an officer and/or director of
AMAG Pharmaceuticals, Inc., or the Company, Forms 3, 4 and 5
(including any amendments thereto) in accordance with Section
16(a) of the Securities Exchange Act of 1934,
as amended and the rules thereunder;
(2) do and perform any and all acts for and on behalf of the
undersigned which may be necessary or desirable to complete
the execution of any such Forms 3, 4 and 5 and the timely filing
of such forms with the United States Securities and Exchange
Commission and any other authority; and
(3) take any other action of any type whatsoever in connection
with the foregoing which,in the opinion of such attorney-in-fact
may be of benefit to,in the best interest of,or legally required
by,the undersigned,it being understood that the documents
executed by such attorney-in-fact on behalf of the undersigned
pursuant to this Power of Attorney shall be in such form and
shall contain such terms

and conditions as such attorney-in-fact
may approve in his discretion.
The undersigned hereby grants to each such attorney-in-fact full
power and authority to do and perform all and every act and thing
whatsoever requisite, necessary and proper to be done in the
exercise of any of the rights and powers herein granted,as fully
to all intents and purposes as the undersigned might or could do
if personally present,with full power of substitution or revocation
hereby ratifying and confirming all that such attorney-in-fact, or
his substitute or substitutes, shall lawfully do or cause to be done
by virtue of this Power of Attorney and the rights and powers herein
granted. The undersigned acknowledges that the foregoing
attorneys-in-fact, in serving in such capacity at the request of
the undersigned, are not assuming, nor is the Company assuming,
any of the undersigneds responsibilities to comply with Section 16
of the Securities Exchange Act of 1934, as amended.
This Power of Attorney replaces in their entirety any and all
prior powers of attorney executed by the undersigned with respect
to the subject matters set forth herein, including any powers of
attorney previously filed with the Securities and Exchange
Commission. This Power of Attorney shall remain in full force
and effect until the undersigned is no longer required to file
Forms 3, 4 and 5 with respect to the undersigneds holdings of and
transactions in securities issued by the Company, unless earlier
revoked by the undersigned in a signed writing delivered to the
foregoing attorneys-in-fact.
IN WITNESS WHEREOF, the undersigned has caused this Power of
Attorney to be executed this 1st day of April 2019.
Signed: /s/ Kathrine O'Brien
Please Print: Kathrine O'Brien